This paper reports the whispering gallery mode (WGM) splitting behavior as-observed between pairs of size-matched microspheres with tight-binding positions. Dye-doped microspheres were excited by pulsed lasers in order that the WGM laser spectra could be monitored. Via analysis of experimental results, we investigated the effects of spacing between two coupled microspheres on coupling strength, and found that coupling strength was increased with decreasing spacing between the microspheres through mode splitting spectra. We demonstrated the effects of environment refractive index (RI) of coupling spot on mode splitting spectra through dripping liquid on the slit of the bi-spheres, and observed that coupling strength changes with the influence of RI. Furthermore, temperature-dependent experiments showed that temperature change will not disturb the mode splitting behavior, this structure exhibits potential for self-referencing sensing.

本文报告了在具有紧密结合位置的大小匹配的微球对之间观察到的回音壁模式 (WGM) 分裂行为。染料掺杂的微球被脉冲激光激发，以便可以监测 WGM 激光光谱。通过对实验结果的分析，我们研究了两个耦合微球间距对耦合强度的影响，通过模式分裂光谱发现，耦合强度随着微球间距的减小而增加。我们通过将液体滴在双球体的狭缝上证明了耦合点的环境折射率（RI）对模式分裂光谱的影响，并观察到耦合强度随 RI 的影响而变化。此外，